Replacing the rear wheel bearing on a Nissan Sunny: a guide for car owners

Rear wheel bearing on Nissan Sunny (especially models N16 And B15) is one of those parts that wears out gradually, but its malfunction cannot be ignored. Grinding noise when driving, vibration at speed, or uneven tire wear - all these are signals that the bearing requires replacement. Car repair shops charge from 3 to 6 thousand rubles for such work, but if you have the tools and patience, you can save money by doing the repairs yourself.

In this article we will look at the process of replacing the rear wheel bearing with Nissan Sunny step by step: from diagnostics to assembly. You will learn what tools you will need, how to properly remove and install the bearing, and what mistakes do beginners most often make when working with the rear hub on front-wheel drive Nissan models?. We will pay special attention to the nuances associated with the suspension design Sunnyto avoid damage to the brake disc or axle shaft.

Signs of a bad rear wheel bearing

A wheel bearing rarely fails suddenly; wear usually occurs gradually. The main thing is not to miss the first symptoms in order to prevent the wheel from jamming while driving. Here are the main signs to look out for:

• 🔊 Crunching or humming from the rear wheel, which intensifies when cornering or at speeds above 60 km/h. The sound may resemble tire noise, but becomes louder as the bearing is loaded.
• 🌀 Vibration on the steering wheel or body, especially noticeable during acceleration. If the vibration disappears when braking, the problem is most likely in the bearing, and not in the imbalance of the wheels.
• 🔥 Hub overheating. After driving, touch the rear wheel (carefully!). If the hub is hotter than on other wheels, the bearing operates with increased friction.
• 🚗 Uneven tire wear. A worn bearing can cause wheel play, which leads to the rubber “eating” on one side.

On Nissan Sunny With a rear drum brake system (models before 2006), diagnosis is complicated by the fact that the bearing is hidden behind the brake drum. To check its condition, you will have to remove the wheel and drum. On versions with disc brakes (e.g. Sunny N16 with motor QG18DE) access to the bearing is easier, but requires removing the caliper and brake disc.

⚠️ Attention: If while driving you hear metallic grinding or the wheel starts to “steer” to the side, stop immediately! These are signs of critical wear of the bearing, which can jam at any moment.

What tools and spare parts will be needed

Before starting work, prepare everything you need. To replace the rear wheel bearing with Nissan Sunny you will need:

• 🔧 Special tools:
  • Wheel bearing puller (or universal three-legged puller).
  • Hydraulic press or powerful vice (for pressing in a new bearing).
  • Torque wrench (for tightening the hub nut with a torque of 80–100 Nm).
• 🔨 Standard set:
  • Wrenches 17, 19, 22 mm (including box and socket).
  • 30mm socket for hub nut.
  • Hammer, chisel, pry bar.
  • WD-40 or similar penetrating lubricant.
• 🛠️ Spare parts:
  • New wheel bearing (part number for Sunny N16: 40520-4M000 or analogues NSK, Koyo).
  • New hub nut (disposable, article number: 40506-4M000).
  • Bearing grease (e.g. Molykote BR2 Plus).

Spare part/tool	Article (original)	Analogues	Note
Wheel bearing	40520-4M000	NSK 6206DDU, Koyo 6206-2RS	Models with ABS require a magnetic ring bearing
Hub nut	40506-4M000	Any new nut of strength class 10	Replacement is required every time it is removed!
Lubrication	—	Molykote BR2 Plus, LIQUI MOLY LM47	Do not use graphite lubricant!

If you don't have a press, you can rent one from a garage or use a vice with adapters. The main thing is not to press the bearing with a hammer, so as not to damage the seating surfaces. For Nissan Sunny with ABS, it is important to choose a bearing with a magnetic ring (if provided by the design), otherwise the wheel speed sensor will not work correctly.

Preparing the vehicle: removing the wheel and brake mechanism

Before starting work, place the vehicle on a level surface and secure the front wheels with chocks. Jack up the rear and place it on reliable supports - Working with one jack is dangerous! Remove the wheel and begin disassembling the brake mechanism.

On models Sunny with drum brakes the procedure is as follows:

1. Remove the hub protective cap (pry it off with a screwdriver).
2. Loosen the hub nut with a 30mm wrench (you may need an extension and lever).
3. Remove the brake drum. If it is stuck, treat the seat with WD-40 and carefully knock it with a hammer through a wooden spacer.

On versions with disc brakes (For example, Sunny N16):

1. Unscrew the caliper (two 14 mm bolts) and hang it on a wire so as not to damage the brake hose.
2. Remove the brake rotor (you may need to knock it out with a hammer if it is stuck to the hub).
3. Unscrew the hub nut completely and remove the washer.

⚠️ Attention: If on your Sunny If ABS is installed, do not pull the brake hose when removing the caliper - this may damage the wheel speed sensor. Also make sure that the sensor is not exposed to dirt or metal shavings.

After removing the brake mechanism you will have access to the hub. At this stage, you can check the bearing play by rocking the hub with your hands. If there is play, the bearing definitely needs to be replaced.

Support the vehicle|Remove the wheel and wheel cap|Loosen the hub nut|Remove the brake drum/disc and caliper|Check hub play-->

Removing and installing the wheel bearing: step-by-step instructions

Now we move on to the most important stage - dismantling the old bearing and installing a new one. On Nissan Sunny The hub is usually removable, but in some cases the bearing is pressed directly into the steering knuckle. We will consider both options.

Option 1: Removable hub (most Sunny models)

1. Removing the hub: After unscrewing the hub nut, pull the hub towards you. If it does not come off, use a puller or carefully knock it with a hammer through a wooden spacer. Don't hit the thread!
2. Bearing removal: Clamp the hub in a vice and use a puller to press out the bearing. If there is no puller, you can knock it out through the mandrel, but this is risky - you can damage the seat.
3. Cleaning and preparation: Thoroughly clean the hub of old grease and dirt. Check the seat for scoring or corrosion.
4. Installing a new bearing: Apply a thin layer of grease to the seat and press in the new bearing using a mandrel (an old bearing race will do). The pressing must be smooth, without distortions!

Option 2: Bearing in the steering knuckle (less common on Sunny)

If the bearing is pressed into the steering knuckle, the process is more complicated:

1. Remove the retaining ring from the inside of the knuckle (pliers will be required).
2. Using a puller or press, press out the old bearing.
3. Clean the seat and press in a new bearing, using the old race as a mandrel.
4. Reinstall the retaining ring.

After installing the bearing, apply lubricant to the inner race and install the hub in place. Tighten the hub nut with a torque wrench 80–100 Nm (for Sunny with motor GA16DE — 90 Nm, for QG18DE - 100 Nm).

Assembly and inspection after replacement

After installing the new bearing, reassemble everything in reverse order:

1. Install the brake disc (if removed).
2. Attach the caliper (for disc brakes) or drum (for drum brakes).
3. Put the wheel on and lower the car.
4. Tighten the wheel bolts crosswise to a torque of 90–110 Nm.

Now you need to check the operation of the bearing:

• 🚗 Ride at low speed (20–30 km/h) and listen to outside noises.
• 🌀 Check for vibration on the steering wheel and body.
• 🔥 After the trip, touch the hub - it should not be hot.

⚠️ Attention: For the first 100–200 km after replacement, avoid sudden acceleration and braking to allow the new bearing to break in. Also check the brake fluid level - it may have leaked out when removing the caliper.

Common replacement mistakes and how to avoid them

Even experienced car owners sometimes make mistakes when replacing a wheel bearing. Here are the most common ones and how to prevent them:

• 🔨 Using a hammer for pressing. Impacts on the bearing lead to microcracks and reduce its life. Always use a press or mandrel.
• 🧲 They forget about the magnetic ring (for models with ABS). If you install a bearing without a ring, the ABS sensor will show incorrect data.
• 🔧 Reusing an old hub nut. This nut is disposable! When re-tightened, it may not provide the required torque, which will lead to backlash.
• 🛠️ Insufficient cleaning of the seat. Dirt or rust under the bearing causes it to misalign and quickly wear out.

Another common mistake is Improper tightening of the hub nut. If you overtighten, the bearing will overheat; if you don't tighten it enough, there will be a backlash. Always use a torque wrench! For Nissan Sunny tightening torque is 80–100 Nm (see the manual for your modification for exact values).

Also, many people forget to check axle condition when replacing a bearing. If there is scoring or corrosion, it can damage the new bearing. In this case, the axle shaft also needs to be replaced or repaired.

What to do if the bearing jams while driving?

If the bearing jams while driving, immediately pull over to the side of the road and don't try to keep moving - this can lead to wheel locking and loss of control. Call a tow truck or try to carefully get to the service station in tow (if the jam is incomplete). Never pour water on the hub to cool it - this can deform the metal.

Cost of work and spare parts: comparison with a car service

If you decide to replace the rear wheel bearing with Nissan Sunny in a car service, the cost of work and spare parts will be as follows:

Item	Cost (RUB)	Note
Bearing (original)	2 500–4 000	Analogues NSK/Koyo — 1,800–2,500 rub.
Hub nut	150–300	Required to be replaced
Service work	3 000–6 000	Depends on region and complexity
Lubrication	300–800	Molykote BR2 Plus or analogues
Total (with work)	6 000–11 000	Without taking into account additional work (for example, replacing the axle shaft)

If you replace it yourself, your costs will be limited only to spare parts and lubricant - 2,000–3,500 rubles. However, if you don’t have a tool (puller, press, torque wrench), buying or renting one can reduce your savings to zero. In this case, it is more advisable to contact the service.

It is also worth considering work guarantee. Most auto repair shops provide a 6-12 month warranty on bearing replacements. When making repairs yourself, all responsibility falls on you.

FAQ: Frequently asked questions about replacing the wheel bearing on a Nissan Sunny

Is it possible to drive with a humming bearing if it does not play?

No, you cannot drive with a worn bearing, even if there is no play. The hum indicates the destruction of the separator or balls, which can lead to the wheel jamming at any time. It is especially dangerous to ignore the problem at high speeds.

Which bearing is better to choose: original or analogue?

Original bearings Nissan (article 40520-4M000) are reliable, but expensive. Good analogues - NSK or Koyo (Japanese production). Budget options you can consider SKF or FAG, but their resource may be lower. The main thing is to avoid Chinese no-name bearings.

Do I need to replace the bearing on both sides if only one is humming?

Not necessarily. Bearings wear out independently of each other. It only makes sense to change both if the car's mileage exceeds 150–200 thousand km, or if the second bearing also shows signs of wear (play, noise).

What happens if you don't replace the hub nut?

The hub nut is a one-time use item. If used repeatedly, it may not provide the required tightening torque, which will lead to hub play and accelerated bearing wear. In the worst case, the wheel may fall off while driving.

Is it possible to replace a bearing without a puller?

Theoretically yes, but it's risky. Without a puller, you will have to knock out the bearing with a hammer through a mandrel, which can damage the seat in the hub. If you still decide to do without a puller, use a copper or aluminum mandrel and hit it carefully, evenly around the circumference.